The US military conducted airstrikes at a location in western Mosul more than a week ago where there were allegations of civilian casualties, U.S. Central Command said Saturday.

The military said it determined that warplanes struck Islamic State fighters and equipment on March 17, but it's also investigating whether civilian casualties occurred.

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Also Saturday, Iraq's Ministry of Defense opened an investigation into an "aerial bombardment incident" that took place in the same area of the city on March 22 and 23, said Col. Laith Al-Nuaimi, a ministry spokesman.

Bashar al Kiki, chairman of the Nineveh Provincial Council, told CNN Saturday that as many as 200 people were killed those days in "indiscriminate airstrikes" he blamed on Iraqi and coalition air forces in the western Mosul neighborhoods of al Jadidah, al Amel and al Yarmouk.

The U.S. Central Command report doesn't mention strikes on March 22-23.

US and Iraqi forces are making an all-out push to regain Mosul from ISIS. Iraq's second-largest city has been under the terrorist group's control since 2014.

The U.S. military previously said it was trying to determine the validity of allegations that sometime between March 17 and 23, U.S. warplanes dropped bombs in a western Mosul neighborhood that killed more than 200 civilians.

The reports that military officials are looking into are based largely on local and social media accounts of the strikes.

After an initial review of strike data from March 16 to 23, the U.S. military said Saturday that ISIS targets were hit March 17 at the request of Iraqi security forces.

The military has opened a formal probe "to determine the facts surrounding this strike and the validity of the allegation of civilian casualties."

"The coalition respects human life, which is why we are assisting our Iraqi partner forces in their effort to liberate their lands from ISIS brutality," U.S. Central Command said in a statement Saturday.

"Our goal has always been for zero civilian casualties, but the coalition will not abandon our commitment to our Iraqi partners because of ISIS's inhuman tactics terrorizing civilians, using human shields, and fighting from protected sites such as schools, hospitals, religious sites and civilian neighborhoods."

The U.S. military is also investigating allegations of civilian casualties during two recent airstrikes in Syria.

New tactics in western Mosul

The head of the Mosul city council, Basma Baseem, told CNN Friday that the recovery operation was continuing in the west Mosul neighborhoods and that the death toll would likely rise.

Anger is high over airstrikes in those neighborhoods.

Kiki demanded an end to military operations in the area until the safety of civilians can be guaranteed. "Most of (those) killed are civilians, among them children and women," he said.

Local and UN officials have said hundreds of thousands of civilians are trapped in areas under ISIS control in western Mosul.

The United Nations also said it is "profoundly concerned" over reports "of a high number of civilian casualties" in the city's al Jadidah section this week.

Determined to keep civilians out of harm's way, Iraqi security forces adopted new tactics Saturday in their quest to recapture western Mosul from ISIS.

Mortars are being used on a smaller scale and are only targeting specific areas, said Col. Abdul Rahman Al-Khazali, an Iraqi Federal Police media adviser.

Police and the rapid response units pushed forward with more snipers and drones and more soldiers on foot, he said.

"We have reached the old city. It's more complicated warfare," according to Lt. Col. Abdul Amir Muhammadawi, spokesman for the rapid response teams.

"The old city has old buildings and small alleyways, and to protect the civilians, we need new tactics."